AD 77-25-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Enstrom Helicopter Corporation, The | 280C | Airworthiness Directives; Enstrom Model F28C and 280C Helicopters |
| aircraft | Enstrom Helicopter Corporation, The | F-28C | Airworthiness Directives; Enstrom Model F28C and 280C Helicopters |
Unsafe Condition
Improper idle mixture adjustment and internal injector leakage can cause RPM fluctuations and engine stoppage during flight, leading to loss of engine power.
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Required Actions
Inspect and adjust idle mixture per Enstrom Service Information Letter No. 0069 steps 4C-4G. Install Enstrom Kit 28-121015 within three calendar months or 100 hours time in service. Update RFM with specified limitations, procedures, and placards.
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Compliance Time
Prior to further flight and within the next three calendar months or 100 hours time in service, whichever occurs first.
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Affected Aircraft
Enstrom Helicopter Corporation models F28C and 280C helicopters certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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